SD

Description

SD[i, j] is the (FeynCalc-external) Kronecker-delta for SU(N) with color indices i and j. SD[i,j] is transformed into SUNDelta[SUNIndex[i],SUNIndex[j]] by FeynCalcInternal.

See also:  SUNDelta.

Examples

SD[a, b]

% // FCI // StandardForm

% // FCE // StandardForm